How much does a size m oxygen tank weigh?

A size M oxygen tank, also known as an E tank, typically weighs around 3 to 4.5 pounds (1.4 to 2 kg) when empty. When filled, its weight can increase to approximately 10 to 15 pounds (4.5 to 6.8 kg), depending on the specific tank and the amount of oxygen it contains. Always check the manufacturer’s specifications for exact weights.